Question

according to newtons second law as given in the video, which equation best represents the relationship?
a. force = mass × acceleration
b. acceleration = force × mass
c. mass = force × acceleration
d. force = mass + acceleration
why did the presenter decide a regular - sized dodgeball thrown with more force was the best strategy?
a. because more force gives more acceleration and a higher velocity, making it harder to dodge
b. because a larger mass always improves accuracy
c. because balanced forces increase speed
d. because gravity does not affect thrown dodgeballs
what two quantities describe an objects motion as mentioned in the video?
a. mass and weight
b. velocity and acceleration
c. temperature and pressure
d. length and width

Explanation:

• First question: Newton's second law states that \(F = ma\) (Force = mass × acceleration).
• Second question: From \(F = ma\), more force (\(F\)) with same mass (\(m\)) gives more acceleration (\(a\)). Higher acceleration leads to higher velocity (\(v = u+at\), assuming initial velocity \(u = 0\)), making it harder to dodge.
• Third question: Velocity (\(v\)) describes the rate of change of position and acceleration (\(a\)) describes the rate of change of velocity, which are key in motion.

Answer:

• First question: A. Force = mass × acceleration
• Second question: A. Because more force gives more acceleration and a higher velocity, making it harder to dodge
• Third question: B. Velocity and acceleration